KEEP A TIGHT REIN ON YOUR AGAPANTHUS
Labelled a weed in the Auckland region, the cheerful blue flowers of agapanthus are still a visible part of the landscape. Opinions are divided. Gardeners who are pro-agapanthus point out that it’s extremely hardy, grows on inhospitable clay, is salt-tolerant, very low maintenance and its fleshy roots stabilise steep banks. The anti camp say these attributes are what make it weedy. One can look at agapanthus as being very good at suppressing weeds but pure stands of agapanthus reduce biodiversity by excluding all other species. It is a prolific seeder. Seeds are blown short distances, drop down banks or get transported by water. Rhizomes spread when soil is moved or plants are dumped. Ideally you should try to grow low-fertility or sterile varieties and at the very least dead-head spent flowers of fertile plants near at-risk areas before the seeds have ripened.